00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
296 lines
8.5 KiB
C
296 lines
8.5 KiB
C
/* $NetBSD: mutex.c,v 1.6 2015/07/08 17:28:59 christos Exp $ */
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/*
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* Copyright (C) 2004, 2005, 2007, 2008, 2011, 2012, 2014, 2015 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2000-2002 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: mutex.c,v 1.18 2011/01/04 23:47:14 tbox Exp */
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/*! \file */
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#include <config.h>
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#include <stdio.h>
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#include <time.h>
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#include <sys/time.h>
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#include <errno.h>
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#include <isc/mutex.h>
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#include <isc/util.h>
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#include <isc/strerror.h>
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#if ISC_MUTEX_PROFILE
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/*@{*/
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/*% Operations on timevals; adapted from FreeBSD's sys/time.h */
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#define timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
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#define timevaladd(vvp, uvp) \
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do { \
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(vvp)->tv_sec += (uvp)->tv_sec; \
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(vvp)->tv_usec += (uvp)->tv_usec; \
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if ((vvp)->tv_usec >= 1000000) { \
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(vvp)->tv_sec++; \
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(vvp)->tv_usec -= 1000000; \
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} \
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} while (/*CONSTCOND*/0)
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#define timevalsub(vvp, uvp) \
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do { \
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(vvp)->tv_sec -= (uvp)->tv_sec; \
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(vvp)->tv_usec -= (uvp)->tv_usec; \
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if ((vvp)->tv_usec < 0) { \
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(vvp)->tv_sec--; \
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(vvp)->tv_usec += 1000000; \
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} \
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} while (/*CONSTCOND*/0)
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/*@}*/
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#define ISC_MUTEX_MAX_LOCKERS 32
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typedef struct {
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const char * file;
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int line;
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unsigned count;
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struct timeval locked_total;
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struct timeval wait_total;
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} isc_mutexlocker_t;
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struct isc_mutexstats {
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const char * file; /*%< File mutex was created in. */
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int line; /*%< Line mutex was created on. */
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unsigned count;
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struct timeval lock_t;
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struct timeval locked_total;
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struct timeval wait_total;
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isc_mutexlocker_t * cur_locker;
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isc_mutexlocker_t lockers[ISC_MUTEX_MAX_LOCKERS];
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};
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#ifndef ISC_MUTEX_PROFTABLESIZE
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#define ISC_MUTEX_PROFTABLESIZE (1024 * 1024)
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#endif
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static isc_mutexstats_t stats[ISC_MUTEX_PROFTABLESIZE];
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static int stats_next = 0;
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static isc_boolean_t stats_init = ISC_FALSE;
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static pthread_mutex_t statslock = PTHREAD_MUTEX_INITIALIZER;
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isc_result_t
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isc_mutex_init_profile(isc_mutex_t *mp, const char *file, int line) {
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int i, err;
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err = pthread_mutex_init(&mp->mutex, NULL);
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if (err == ENOMEM)
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return (ISC_R_NOMEMORY);
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if (err != 0)
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return (ISC_R_UNEXPECTED);
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RUNTIME_CHECK(pthread_mutex_lock(&statslock) == 0);
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if (stats_init == ISC_FALSE)
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stats_init = ISC_TRUE;
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/*
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* If all statistics entries have been used, give up and trigger an
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* assertion failure. There would be no other way to deal with this
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* because we'd like to keep record of all locks for the purpose of
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* debugging and the number of necessary locks is unpredictable.
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* If this failure is triggered while debugging, named should be
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* rebuilt with an increased ISC_MUTEX_PROFTABLESIZE.
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*/
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RUNTIME_CHECK(stats_next < ISC_MUTEX_PROFTABLESIZE);
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mp->stats = &stats[stats_next++];
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RUNTIME_CHECK(pthread_mutex_unlock(&statslock) == 0);
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mp->stats->file = file;
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mp->stats->line = line;
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mp->stats->count = 0;
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timevalclear(&mp->stats->locked_total);
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timevalclear(&mp->stats->wait_total);
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for (i = 0; i < ISC_MUTEX_MAX_LOCKERS; i++) {
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mp->stats->lockers[i].file = NULL;
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mp->stats->lockers[i].line = 0;
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mp->stats->lockers[i].count = 0;
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timevalclear(&mp->stats->lockers[i].locked_total);
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timevalclear(&mp->stats->lockers[i].wait_total);
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}
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return (ISC_R_SUCCESS);
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}
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isc_result_t
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isc_mutex_lock_profile(isc_mutex_t *mp, const char *file, int line) {
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struct timeval prelock_t;
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struct timeval postlock_t;
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isc_mutexlocker_t *locker = NULL;
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int i;
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gettimeofday(&prelock_t, NULL);
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if (pthread_mutex_lock(&mp->mutex) != 0)
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return (ISC_R_UNEXPECTED);
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gettimeofday(&postlock_t, NULL);
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mp->stats->lock_t = postlock_t;
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timevalsub(&postlock_t, &prelock_t);
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mp->stats->count++;
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timevaladd(&mp->stats->wait_total, &postlock_t);
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for (i = 0; i < ISC_MUTEX_MAX_LOCKERS; i++) {
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if (mp->stats->lockers[i].file == NULL) {
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locker = &mp->stats->lockers[i];
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locker->file = file;
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locker->line = line;
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break;
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} else if (mp->stats->lockers[i].file == file &&
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mp->stats->lockers[i].line == line) {
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locker = &mp->stats->lockers[i];
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break;
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}
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}
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if (locker != NULL) {
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locker->count++;
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timevaladd(&locker->wait_total, &postlock_t);
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}
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mp->stats->cur_locker = locker;
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return (ISC_R_SUCCESS);
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}
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isc_result_t
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isc_mutex_unlock_profile(isc_mutex_t *mp, const char *file, int line) {
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struct timeval unlock_t;
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UNUSED(file);
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UNUSED(line);
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if (mp->stats->cur_locker != NULL) {
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gettimeofday(&unlock_t, NULL);
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timevalsub(&unlock_t, &mp->stats->lock_t);
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timevaladd(&mp->stats->locked_total, &unlock_t);
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timevaladd(&mp->stats->cur_locker->locked_total, &unlock_t);
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mp->stats->cur_locker = NULL;
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}
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return ((pthread_mutex_unlock((&mp->mutex)) == 0) ? \
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ISC_R_SUCCESS : ISC_R_UNEXPECTED);
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}
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void
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isc_mutex_statsprofile(FILE *fp) {
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isc_mutexlocker_t *locker;
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int i, j;
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fprintf(fp, "Mutex stats (in us)\n");
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for (i = 0; i < stats_next; i++) {
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fprintf(fp, "%-12s %4d: %10u %lu.%06lu %lu.%06lu %5d\n",
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stats[i].file, stats[i].line, stats[i].count,
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stats[i].locked_total.tv_sec,
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stats[i].locked_total.tv_usec,
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stats[i].wait_total.tv_sec,
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stats[i].wait_total.tv_usec,
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i);
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for (j = 0; j < ISC_MUTEX_MAX_LOCKERS; j++) {
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locker = &stats[i].lockers[j];
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if (locker->file == NULL)
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continue;
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fprintf(fp, " %-11s %4d: %10u %lu.%06lu %lu.%06lu %5d\n",
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locker->file, locker->line, locker->count,
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locker->locked_total.tv_sec,
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locker->locked_total.tv_usec,
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locker->wait_total.tv_sec,
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locker->wait_total.tv_usec,
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i);
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}
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}
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}
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#endif /* ISC_MUTEX_PROFILE */
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#if ISC_MUTEX_DEBUG && defined(PTHREAD_MUTEX_ERRORCHECK)
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isc_result_t
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isc_mutex_init_errcheck(isc_mutex_t *mp)
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{
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pthread_mutexattr_t attr;
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int err, errd;
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if (pthread_mutexattr_init(&attr) != 0)
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return (ISC_R_UNEXPECTED);
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if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK) != 0) {
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errd = pthread_mutexattr_destroy(&attr);
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RUNTIME_CHECK(errd == 0);
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return (ISC_R_UNEXPECTED);
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}
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err = pthread_mutex_init(mp, &attr) != 0)
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errd = pthread_mutexattr_destroy(&attr);
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RUNTIME_CHECK(errd == 0);
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if (err == ENOMEM)
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return (ISC_R_NOMEMORY);
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return ((err == 0) ? ISC_R_SUCCESS : ISC_R_UNEXPECTED);
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}
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#endif
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#if ISC_MUTEX_DEBUG && defined(__NetBSD__) && defined(PTHREAD_MUTEX_ERRORCHECK)
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pthread_mutexattr_t isc__mutex_attrs = {
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PTHREAD_MUTEX_ERRORCHECK, /* m_type */
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0 /* m_flags, which appears to be unused. */
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};
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#endif
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#if !(ISC_MUTEX_DEBUG && defined(PTHREAD_MUTEX_ERRORCHECK)) && !ISC_MUTEX_PROFILE
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isc_result_t
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isc__mutex_init(isc_mutex_t *mp, const char *file, unsigned int line) {
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char strbuf[ISC_STRERRORSIZE];
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isc_result_t result = ISC_R_SUCCESS;
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int err;
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#ifdef HAVE_PTHREAD_MUTEX_ADAPTIVE_NP
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pthread_mutexattr_t attr;
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int errd;
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if (pthread_mutexattr_init(&attr) != 0)
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return (ISC_R_UNEXPECTED);
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if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP) != 0) {
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errd = pthread_mutexattr_destroy(&attr);
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RUNTIME_CHECK(errd == 0);
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return (ISC_R_UNEXPECTED);
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}
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err = pthread_mutex_init(mp, &attr);
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errd = pthread_mutexattr_destroy(&attr);
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RUNTIME_CHECK(errd == 0);
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#else /* HAVE_PTHREAD_MUTEX_ADAPTIVE_NP */
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err = pthread_mutex_init(mp, ISC__MUTEX_ATTRS);
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#endif /* HAVE_PTHREAD_MUTEX_ADAPTIVE_NP */
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if (err == ENOMEM)
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return (ISC_R_NOMEMORY);
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if (err != 0) {
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isc__strerror(err, strbuf, sizeof(strbuf));
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UNEXPECTED_ERROR(file, line, "isc_mutex_init() failed: %s",
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strbuf);
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result = ISC_R_UNEXPECTED;
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}
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return (result);
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}
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#endif
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